Java + DOM：注册和使用修改监听器：教程？

Question

Please point me to some tutorials or other explaining examples about how to register and use modification listeners with Java's DOM implementation.

On the web I find only Javascript or Flex examples.

My target is to get to know when a Node was modified.

I tried out several approaches, nothing works. Could it be that Java's DOM doesn't support this feature?

Answer 1

Got it!

Casting was the trick!

I was looking for implementations of org.w3.dom.events.EventTarget , but it seems that only internal classes implement it. So it have just to be casted by hand (by just assuming that Node instanceof EventTarget ).

org.w3c.dom.events.EventListener myModificationListener =
  new org.w3c.dom.events.EventListener() {

    @Override
    public void handleEvent(Event e) {
      if (e instanceof MutationEvent) {
        MutationEvent me = (MutationEvent) e;
        System.out.println("type: " + me.getType()
          + ", dest: " + me.getTarget());
      }
    }

  };

Node someDomNode = ...

// here the unusual casting magic happens
((EventTarget) node).addEventListener(
  "DOMSubtreeModified", // constant
  myModificationListener, true);

// modify the node here by appending a child
// -> listener gets invoked